Question: What would be the best a levels in order to have a career in aeronautical engineering?

I’d agree with Aurelia, maths and physics will be very helpful. One other thing you might consider in your spare time is joining the Air Training Corps if you have one near you. You have to be a minimum age to join (13 1/3 yrs old I think) and you will get a uniform and you will do drill and learn about the military and RAF.

But, as you progress through, you learn about the theory of flight and how planes fly. I also was lucky enough to do glider training, on motorised and non-motorised gliders and it was really cool.

Wing Field Day was really fun. It was like a school sports day but against other squadrons. Good for building extra-curricular things for your UCAS form!